631371994 has 8 divisors (see below), whose sum is σ = 1033154208. Its totient is φ = 286987260.

The previous prime is 631371971. The next prime is 631372013. The reversal of 631371994 is 499173136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 631371994.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14349342 + ... + 14349385.

It is an arithmetic number, because the mean of its divisors is an integer number (129144276).

Almost surely, 2^631371994 is an apocalyptic number.

631371994 is a deficient number, since it is larger than the sum of its proper divisors (401782214).

631371994 is a wasteful number, since it uses less digits than its factorization.

631371994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28698740.

The product of its digits is 122472, while the sum is 43.

The square root of 631371994 is about 25127.1167068568. The cubic root of 631371994 is about 857.8837429396.

The spelling of 631371994 in words is "six hundred thirty-one million, three hundred seventy-one thousand, nine hundred ninety-four".